Cis ceQTLs on autosomes versus X chromosome. Mean absolute value cis α on autosomes and X chromosomes for (A) human RH, (B) mouse RH and (C) TCGA male. (D) Mean absolute value cis α for positive (dark grey) and negative (light grey) ceQTLs on the autosomes and X chromosome in human RH, mouse RH, male TCGA, female TCGA and all TCGA. Mean absolute value α for X-linked genes regulated in trans are also shown. Error bars are s.e.m.